Deriving Carrier Frequency from Phase-Phase PWM

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Joined Apr 15, 2010
I have a phase-phase PWM signal for a variable speed drive (i.e. two sinusoidally weighted PWM signals, 120' out of phase, superimposed), and apparently there is an equation you can use to calculate the carrier frequency of the individual PWM signals, but i haven't been able to find it yet (been searching on the net and in the book "Pulse Width Modulation for Power Converters : Principles and Practice")

If anyone could help out that would be great.